2 publications

2 publications

Helichrome: Synthesis and Enzymatic Activity of a Designed Hemeprotein

Kaiser, E.T.; Sasaki, T.

J. Am. Chem. Soc. 1989, 111, 380-381, 10.1021/ja00183a065


Metal: Fe
Ligand type: Porphyrin
Host protein: Artificial construct
Anchoring strategy: Covalent
Optimization: ---
Max TON: ---
ee: ---
PDB: ---
Notes: Only 60 amino acids

Sequence-Specific Peptide Cleavage Catalyzed by an Antibody

Lerner, R.A.

Science 1989, 243, 1184-1188, 10.1126/science.2922606

Monoclonal antibodies have been induced that are capable of catalyzing specific hydrolysis of the Gly-Phe bond of peptide substrates at neutral pH with a metal complex cofactor. The antibodies were produced by immunizing with a Co(III) triethylenetetramine (trien)-peptide hapten. These antibodies as a group are capable of binding trien complexes of not only Co(III) but also of numerous other metals. Six peptides were examined as possible substrates with the antibodies and various metal complexes. Two of these peptides were cleaved by several of the antibodies. One antibody was studied in detail, and cleavage was observed for the substrates with the trien complexes of Zn(II), Ga(III), Fe(III), In(III), Cu(II), Ni(II), Lu(III), Mg(II), or Mn(II) as cofactors. A turnover number of 6 x 10(-4) per second was observed for these substrates. These results demonstrate the feasibility of the use of cofactor-assisted catalysis in an antibody binding site to accomplish difficult chemical transformations.

Metal: Zn
Ligand type: Tetramine
Host protein: Antibody 28F11
Anchoring strategy: Supramolecular
Optimization: Chemical
Max TON: 400
ee: ---
PDB: ---
Notes: ---